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English definition of “forties”

forties

plural noun (also 40s, 40’s)    /ˈfɔr·t̬iz/
the numbers 40 through 49: The temperature will be in the forties (= between 40° and 49°) today. Our house was built in the forties (= between 1940 and 1949). They are both in their forties (= between 40 and 49 years old).
(Definition of forties plural noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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